Simplex Trading Portfolio holdings
Simplex Trading, founded in 2004 and headquartered in Chicago, Illinois, is a technology-driven proprietary trading firm specializing in market-making and liquidity provision, primarily in U.S. equity options and futures options. Leveraging advanced proprietary software and data-driven analysis, the firm optimizes trading strategies and develops innovative solutions to capitalize on financial market opportunities, maintaining a competitive edge through automation and a collaborative team of technologists and traders. With a workforce exceeding 300 and led by CEO Erik Swanson since 2014, Simplex operates with a low-ego, high-intelligence culture, focusing on minimal bureaucracy and rapid execution, while also making strategic venture capital investments in fintech startups. Recognized as a top workplace in Chicago by Built In’s 2025 awards, Simplex continues to evolve, blending cutting-edge technology with a commitment to market efficiency and growth.
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
GE Aerospace
GE
|
+$36M |
| 2 |
Advanced Micro Devices
AMD
|
+$19.4M |
| 3 |
iShares MSCI EAFE ETF
EFA
|
+$10.2M |
| 4 |
Micron Technology
MU
|
+$6.31M |
| 5 |
Alibaba
BABA
|
+$6.19M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
NVIDIA
NVDA
|
+$25.9M |
| 2 |
SPDR Gold Trust
GLD
|
+$15.3M |
| 3 |
Amazon
AMZN
|
+$9.53M |
| 4 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$9.03M |
| 5 |
State Street Technology Select Sector SPDR ETF
XLK
|
+$7.73M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.49% |
| 2 | Consumer Discretionary | 0.39% |
| 3 | Communication Services | 0.27% |
| 4 | Healthcare | 0.25% |
| 5 | Financials | 0.25% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
876
CALL
AGNC Investment
AGNC
$12.3B
| $7.74M | 0.01% |
455,100
-400
| -0.1% | -$6.48K |
|
877
PUT
Match Group
MTCH
$8.72B
| $7.73M | 0.01% |
48,500
+5,500
| +13% | +$837K |
|
878
Workday
WDAY
$31.6B
| $7.71M | 0.01% |
32,745
+3,544
| +12% | +$878K |
|
879
CALL
Toll Brothers
TOL
$13.7B
| $7.71M | 0.01% |
130,900
-6,400
| -5% | -$378K |
|
|
FIRY
880
CALL
Firy Inc
FIRY
$126M
| $7.71M | 0.01% |
18,905
-125
| -0.7% | -$32.3K |
|
|
ZEN
881
CALL
DELISTED
ZENDESK INC
ZEN
| $7.7M | 0.01% |
53,900
+2,100
| +4% | +$271K |
|
882
BlackBerry
BB
$5.06B
| $7.67M | 0.01% |
630,547
-18,735
| -3% | -$196K |
|
883
CALL
NXP Semiconductors
NXPI
$70B
| $7.67M | 0.01% |
38,000
+400
| +1% | +$83.1K |
|
884
CALL
Allstate
ALL
$65.5B
| $7.66M | 0.01% |
57,700
-10,600
| -16% | -$1.4M |
|
885
Gilead Sciences
GILD
$162B
| $7.64M | 0.01% |
110,542
+23,394
| +27% | +$1.64M |
|
886
PUT
Corteva
CTVA
$59.4B
| $7.63M | 0.01% |
171,000
| – | – |
|
887
Aon
AON
$76B
| $7.62M | 0.01% |
31,923
| – | – |
|
888
PUT
Jazz Pharmaceuticals
JAZZ
$16B
| $7.61M | 0.01% |
42,000
| – | – |
|
889
PUT
Amplify Junior Silver Miners ETF
SILJ
$3.28B
| $7.6M | 0.01% |
411,200
+2,500
| +0.6% | +$33.5K |
|
890
PUT
Aramark
ARMK
$15B
| $7.6M | 0.01% |
284,341
| – | – |
|
891
CALL
Cigna
CI
$75.7B
| $7.6M | 0.01% |
31,900
-2,600
| -8% | -$565K |
|
892
CALL
Box
BOX
$3.92B
| $7.57M | 0.01% |
284,000
+6,800
| +2% | +$167K |
|
893
PUT
Dynatrace
DT
$11.8B
| $7.56M | 0.01% |
126,700
| – | – |
|
894
PUT
Prologis
PLD
$135B
| $7.55M | 0.01% |
62,900
+5,100
| +9% | +$662K |
|
895
CALL
Weyerhaeuser
WY
$17B
| $7.54M | 0.01% |
219,700
+2,100
| +1% | +$73.6K |
|
896
CALL
Molson Coors Class B
TAP
$7.51B
| $7.54M | 0.01% |
139,700
+300
| +0.2% | +$14.7K |
|
897
Roblox
RBLX
$34B
| $7.53M | 0.01% |
87,775
-48,867
| -36% | -$4.01M |
|
898
Abits Group
ABTS
$3.61M
| $7.53M | 0.01% |
22,584
+83
| +0.4% | +$16.2K |
|
899
PUT
Sabre
SABR
$668M
| $7.53M | 0.01% |
597,700
| – | – |
|
|
900
PUT
Molson Coors Class B
TAP
$7.51B
| $7.52M | 0.01% |
139,400
| – | – |
|
Similar funds
Simplex Trading's Q3 2021 Portfolio in Review
As of Q3 2021, Simplex Trading held 10,062 positions worth $107B, up 3.4% from $104B the previous quarter. Its ten largest holdings account for 41% of the portfolio.
Trading was light in Q3 2021: portfolio turnover was 3.5%. Simplex Trading opened 86 new positions and exited 271, leaving the 10,062-position portfolio largely intact.
By sector, the portfolio is most concentrated in Technology at 0.49% of assets, up from 0.47% a quarter earlier, followed by Consumer Discretionary and Communication Services.
- Simplex Trading's largest Q3 2021 buy was Olo Inc: 143,230 shares worth $4.91M.
- Simplex Trading added most to GE Aerospace in Q3 2021, an estimated $36M increase.
- Simplex Trading's biggest Q3 2021 reduction was NVIDIA, cutting an estimated $25.9M.
- Simplex Trading fully exited Amazon in Q3 2021, selling an estimated $9.53M.
- Simplex Trading's ten largest holdings make up 41% of its $107B portfolio in Q3 2021.
- Simplex Trading opened 86 new positions and closed 271 in Q3 2021.
- Simplex Trading's portfolio value rose 3.4% quarter-over-quarter to $107B.
Based on Simplex Trading's 13F filing for Q3 2021, filed 28 Oct 2021.